package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import lombok.SneakyThrows;
import model.Article;
import util.AppVar;
import util.DBUtils;
import util.ResultUtil;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

/**
 * 获取文章细节
 */
@WebServlet("/artdetail")
public class ArtDetailServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Article article=new Article();
        String msg="未知错误!";
        //1.得到前端的参数并校验
        String aidStr=req.getParameter("aid");
        if(!StrUtil.isBlank(aidStr)){
            // 2,查询数据库并获取文章详情
            Connection connection= DBUtils.getConnection();
            String sql="select * from article where aid=?";
           PreparedStatement statement= connection.prepareStatement(sql);
           statement.setInt(1,Integer.valueOf(aidStr));
            ResultSet resultSet=statement.executeQuery();
            if(resultSet.next()){
                article.setAid(resultSet.getInt("aid"));
                article.setTitle(resultSet.getString("title"));
                article.setContext(resultSet.getString("context"));
                String ctime=resultSet.getString("createtime");
                article.setCreatetime(ctime.substring(0,ctime.lastIndexOf(".")));
                article.setReadcount(resultSet.getInt("readcount"));
            }
            msg="";
            //关闭资源
            DBUtils.close(resultSet,statement,connection);
        }else{
            msg="参数错误！";
        }
        //3.将结果返回给前端
            resp.setContentType(AppVar.RESPONSE_CONTENTTYPE_JSON);
            resp.getWriter().println(JSONUtil.toJsonStr(ResultUtil.toResult(
                    200,article,msg)));
        }

    }




